31400142 has 16 divisors (see below), whose sum is σ = 62864640. Its totient is φ = 10455992.

The previous prime is 31400123. The next prime is 31400143. The reversal of 31400142 is 24100413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31400143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5659 + ... + 9737.

It is an arithmetic number, because the mean of its divisors is an integer number (3929040).

Almost surely, 2^31400142 is an apocalyptic number.

31400142 is an abundant number, since it is smaller than the sum of its proper divisors (31464498).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31400142 is a wasteful number, since it uses less digits than its factorization.

31400142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5367.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 31400142 is about 5603.5829609278. The cubic root of 31400142 is about 315.4839022564.

Adding to 31400142 its reverse (24100413), we get a palindrome (55500555).

The spelling of 31400142 in words is "thirty-one million, four hundred thousand, one hundred forty-two".